NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers
- Class 8 Maths Exponents and Powers Exercise 12.1
- Class 8 Maths Exponents and Powers Exercise 12.2
- Exponents and Powers Class 8 Extra Questions
NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Exercise 12.1
Ex 12.1 Class 8 Maths Question 1.
Evaluate:
(i) 3
-2
(ii) (-4)
-2
(iii) (\(\frac { 1 }{ 2 }\))
-5
Solution:
Ex 12.1 Class 8 Maths Question 2.
Simplify and express the result in power notation with a positive exponent.
Solution:
Ex 12.1 Class 8 Maths Question 3.
Find the value of
Solution:
Ex 12.1 Class 8 Maths Question 4.
Solution:
Ex 12.1 Class 8 Maths Question 5.
Find the value of m for which 5
m
÷ 5
-3
= 5
5
.
Solution:
5
m
÷ 5
-3
= 5
5
⇒ 5
m-(-3)
= 5
5
[∵ a
m
÷ a
n
= a
m-n
]
⇒ 5
m+3
= 5
5
Comparing the powers of equal bases, we have
m + 3 = 5
m = 5 – 3 = 2, i.e., m = 2
Ex 12.1 Class 8 Maths Question 6.
Evaluate:
Solution:
Ex 12.1 Class 8 Maths Question 7.
Simplify:
Solution:
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